Apple's new Haswell-powered Retina MacBook Pros have started finding their way into the online score aggregator for popular benchmark suite Geekbench, less than 24 hours after their unveiling.

Backed by Intel's latest silicon, the new MacBook Pros — which first began showing up in late June — achieve similar gains to those notched by the MacBook Air after its Haswell refresh. The laptops' appearance on the site was first noticed by MacRumors.

Single-core scores, which measure performance using only a single CPU core, average 3108 for the 15-inch model and 2823 for the 13-inch variant. Those scores represent modest increases of four and two percent, respectively, over the previous generation.

Despite the moderate upgrade in performance, Tuesday's hardware refresh was still rather significant. Moving to the new Haswell architecture, alongside efficiency improvements courtesy of OS X Mavericks's new power management features, allowed both the 13- and 15-inch models to make battery life gains, increasing to nine and eight hours, respectively, on a single charge.

The 13-inch model also slimmed down to the same 0.71-inch thickness as its larger-screened sibling, while both variants dropped $200 off of their base configuration price tag (Mac Price Guide).

I thought battery life would have been much better. If the Air picked up an hour from Mavericks and the MBP 15" only picked up an hour?

Well remember the 15" MBP Retina has a true Core i7 not a dual core like MBA has, even when upgraded to a Core i7. It also has a 15" a screen, and its a retina. Also, the graphics are more intensive as well. The fact that they were able to pick up an hour with all of this stuff is amazing in itself IMO.

Well remember the 15" MBP Retina has a true Core i7 not a dual core like MBA has, even when upgraded to a Core i7. It also has a 15" a screen, and its a retina. Also, the graphics are more intensive as well. The fact that they were able to pick up an hour with all of this stuff is amazing in itself IMO.

The previous 15" rMBP had the i7 and GT 60M w/1GB so again I wonder why only the 1 hour moving to Hasswell? The new base 15" rMBP has Irus Pro, not the GT 750M.

Removing the graphics card from the base 15" rMBP was a stupid idea. What will happen to performance now??

I was about to buy it, but now I'll have to think twice before doing so..

iris pro 5200 is no slouch for integrated gfx. It runs faster or nearly the same as the 650M from the early 2013 model in most benchmarks I've seen. (though its not anything like the 750M in the new upper end).

The main problem with my last-year rMBP is that too many applications (such as the iPhone/iPad simulator) switch to the discrete graphics card. In that mode the battery only lasts for about four hours.

Since the Iris Pro is much more powerful, it will be nice if most applications didn't resort to the GT 750M. That would significantly increase battery life under higher (and actually more meaningful) loads.